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|A Geologic Walking Tour of Building Stones of Downtown Baltimore, Maryland||contact: Dale Shelton (email@example.com)|
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STOP 11: PARKING GARAGE - Gay Street
Backtrack west on Fayette Street to Gay Street and turn south (left). Walk south on Gay Street continuing ½ -block past Baltimore Street. Notice the parking garage on the west side of Gay Street. Can you guess the type of stone seen in this tan surface with the red base? This is a man-made rock.
A close examination will show that it is an artificial rock called an aggregate. An aggregate is a collection of pebbles, mixed with cement to form a solid man-made rock (Figure 11).
11: Man-made aggregate at the parking garage on Gay
Street (Stop 11).
This pamphlet was prepared by
Sherry McCann-Murray, with contributions and photography by the Environmental
Geology and Mineral Resources Program of the Maryland Geological Survey.
Adapted for the Internet from Educational Series No. 10. For more information see Building Stones of Maryland .
Compiled by the Maryland Geological Survey, 2300 St. Paul Street, Baltimore, MD 21218
This electronic version of "A Brief Description of the Geology of Maryland " was prepared by Bob Conkwright, Division of Coastal and Estuarine Geology, Maryland Geological Survey. Please send comments on this page to Dale Shelton (firstname.lastname@example.org)
State of Maryland
Department of Natural Resources, Resource Assessment Service